https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215250
Bug ID: 215250
Summary: jail break under particular circumstance
Product: Base System
Version: 11.0-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
I do not understand if this is really a bug, anyway i am submitting this
because i think it could be the top of a more complex "iceberg".
How to reproduce:
--------------------------------------------------------
jailhost is the host machine
thejail is the jailed machine
remote#ssh user@thejail // log into the jail from a remote system
thejail$su // became superuser into the jail
thejail#cd /usr/ports // log into any folder of the jail
Now from jailhost move the jail folder
into the jailhost hierarchy
jailhost#mv /jailz/<thejail>/usr/ports /jailz/ports // !!!
Now, from inside thejail
thejail#pwd
/jailz/ports // !!! logged into the host
thejail#cd .. // you can navigate the host filesystem
thejail#pwd
/
thejail#cd etc
thejail#pwd
/etc
thejail#cat rc.conf // see host file contents
hostname="jailhost.mydomain"
...
thejail#uname -a // while you are inside the jail ...
FreeBSD jailhost.mydomain 11.0-RELEASE-p1 ...
--------------------------------------------------------
I understand that this is a very particular situation
and i don't know if it is an expected behaviour
just submitting because it sounds quite unexpected ...
Cheers
Paolo
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